Escape percent sign in QuerySet.extra() method

Hello,
I'm want to use functionality of postgresql module pg_trgm in django. pg_trgm uses special operator % (percent sign). I don't know how should I escape it in query extra method.

# pure SQL
SELECT content, similarity(content, 'string') AS sml
  FROM table
  WHERE content % 'str'
  ORDER BY sml DESC, content;

# This throws exception IndexError 'tuple index out of range'
# I tried to escape percent sign with %%, or \%, but I always get same exception
objects = MyModel.objects.extra(
    select={'rank': 'similarity(content, %s)'},
    select_params=[content],
    where='content % %s',
    params=[content],
    order_by=['-rank']
)

# Raw query works ok
objects = MyModel.objects.raw('''SELECT *, similarity(content, %s) AS sml FROM table WHERE content %% %s ORDER BY sml DESC''', [content, content])

Can you help me how write percent sign in extra() method?

Thank you

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